阅读说明：本技术 一种挖孔环形基桩u型圆钢管模板体系与施工方法 (Hole digging annular foundation pile U-shaped circular steel tube template system and construction method ) 是由 董磊 冯姗 吴现敬 李新颖 李阳 于 2020-09-04 设计创作，主要内容包括：本发明公开了一种挖孔环形基桩U型圆钢管模板体系与施工方法,包括锁口、地层、封底混凝土、吊环、圆钢管模板、定位槽、对中支座、横向加劲肋、纵向加劲肋、黄油、塑料薄膜、钢筋笼、护壁、安装组件、回型钢片和锚固螺栓。本发明的有益效果是：圆钢管模板由钢板焊接而成,并根据挖孔桩的设计尺寸,能够根据需要选定相应长度的钢板,圆钢管模板围合焊接的钢板并非上下同宽的矩形,而是上宽下窄的梯形并保证圆钢管上口的直径与施工设计图相一致,且圆钢管的下端开口直径要比上端开口直径少0.1～0.2D,保证圆钢管模板在焊接时可形成上粗下细“U”型均匀过渡的圆钢管模具。(The invention discloses a U-shaped circular steel tube template system of an excavated annular foundation pile and a construction method. The invention has the beneficial effects that: the circular steel tube template is formed by the steel sheet welding, and according to the design size of bored pile, can select the steel sheet of corresponding length as required, the circular steel tube template encloses and closes welded steel sheet and is not the rectangle with wide from top to bottom, but the diameter that the trapezoidal and assurance circular steel tube of narrow from top to bottom mouth is unanimous with the construction design picture, and the lower extreme opening diameter of circular steel tube will be less than upper end opening diameter 0.1 ~ 0.2D, guarantees that the circular steel tube template can form the circular steel tube mould of thick thin "U" type uniform transition down when the welding.)

1. The utility model provides a hole annular foundation pile U type circular steel tube template system that digs which characterized in that: the steel bar reinforcing steel bar; the locking notch (1) is designed at the top end of a pile hole in a stratum (2), the bottom sealing concrete (3) is poured at the bottom of the pile hole in the stratum (2), the hanging ring (4) is welded and fixed at the top end of the circular steel tube template (5), the circular steel tube template (5) is vertically clamped in the pile hole in the stratum (2), the positioning groove (6) is formed in the bottom of the circular steel tube template (5), the centering support (7) is arranged on the upper surface of the bottom sealing concrete (3), the transverse stiffening rib (8) is horizontally arranged on the inner wall of the circular steel tube template (5), the longitudinal stiffening rib (9) is vertically arranged on the inner wall of the circular steel tube template (5), butter (10) is smeared on the outer wall of the circular steel tube template (5), a plastic film (11) is wrapped on the outer wall of the circular steel tube template (5), and a steel reinforcement cage (12) is nested and connected outside the circular steel tube template (5), the retaining wall (13) is arranged on the outer wall of the steel reinforcement cage (12), the mounting assembly (14) is fixed on the centering support (7), the steel clip (15) is fixedly connected with the centering support (7) through the anchor bolt (16), and the anchor bolt (16) vertically penetrates and is fixed in the bottom sealing concrete (3).

2. The excavated annular foundation pile U-shaped round steel tube template system according to claim 1, characterized in that: the circular steel tube template (5) is formed by welding steel plates and is designed according to the design size of the bored pile.

3. The excavated annular foundation pile U-shaped round steel tube template system according to claim 1, characterized in that: the circular steel tube template (5) encloses and closes welded steel sheet and is not the rectangle of same width from top to bottom, but the diameter of going up the mouth of a circle steel tube and guaranteeing that the width is narrow down is unanimous with the construction design drawing, and the lower extreme opening diameter of circular steel tube will be less than upper end opening diameter 0.1 ~ 0.2D, and D is the diameter of going up the mouth.

4. The excavated annular foundation pile U-shaped round steel tube template system according to claim 1, characterized in that: when the circular steel tube template (5) is constructed, the centering support 7 is firstly fixed in the center of the bottom of the hole, and when the circular steel tube template (5) is slowly hung, the centering support 7 and the positioning groove 6 can be automatically nested together.

5. The excavated annular foundation pile U-shaped round steel tube template system according to claim 1, characterized in that: the circular steel tube template (5) is isolated from the steel reinforcement cage (12) through a plastic film (11) and is in sliding connection with the steel reinforcement cage (12) through grease (10).

6. The construction method of the excavated annular foundation pile U-shaped circular steel tube formwork system based on the claim 1 is characterized by comprising the following steps of:

step A, designing and manufacturing a circular steel tube template (5), a positioning groove (6) and a centering support (7) on the ground according to a pile construction design drawing; after the parts are manufactured, the pointed end of the positioning groove (6) faces the interior of the circular steel tube template (5) and is welded to the lower part of the circular steel tube template (5);

b, constructing a locking notch (1) at the position of the pile hole according to the designed size, excavating the hole along the locking notch (1), constructing a pile hole protecting wall (13) every 1 linear meter until the elevation of the hole bottom is designed, and sealing the bottom by using plain concrete to finish the construction of the pile hole;

c, when the bottom sealing concrete (3) reaches the strength of 7d, installing a centering support (7) in the center of the hole bottom, enabling the center point of the centering support (7) to be overlapped with the center point of the hole bottom, uniformly distributing anchoring bolts (16) on the bottom sealing concrete (3), and clamping the centering support (7) by using a bent steel sheet (15);

d, coating a layer of butter (10) on the surface of the circular steel tube template (5) in a thick mode, and then wrapping a layer of plastic film (11); placing one side for standby after completion;

e, uniformly arranging 4-5 cross braces inside the reinforcement cage 12 from top to bottom; hoisting a reinforcement cage (12) into the pile hole by using a crane, and ensuring that the reinforcement cage is equal in distance with the surrounding retaining walls (13) and is positioned at the center of the pile hole; and the reinforcement cage (12) is fixed from the ground;

step F, integrally hoisting the U-shaped circular steel tube template (5), slowly lowering the U-shaped circular steel tube template, and firmly embedding the centering support and the positioning groove (6) to ensure that the axis of the circular steel tube template (5) is vertical; waterproof foam is arranged at the gap between the circular steel tube template (5) and the bottom sealing concrete (3) to prevent slurry leakage during grouting;

g, injecting concrete outside the circular steel tube template (5) at one time, waiting for condensation and curing;

step H, after the concrete is initially set, inserting a long steel pipe penetrating through the two lifting rings (4), arranging jacks at two ends of the steel pipe respectively, jacking the steel pipe upwards at a constant speed, and hammering the round steel pipe template (5) by using a blasting machine; after the round steel pipe template is separated from the concrete, the round steel pipe template (5) is lifted out by a crane;

step I, dismantling a centering support (7), an anchoring bolt (16) and a bent steel sheet (15) on the bottom sealing concrete (3) to complete the recovery construction of a template system;

and step J, continuing maintaining the pile body to finish the construction of the annular foundation pile.

Technical Field

The invention relates to a positioning adjustable support and an installation method thereof, in particular to a U-shaped circular steel tube template system of an excavated annular foundation pile and a construction method, and belongs to the technical field of positioning adjustable supports and installation methods thereof.

Background

Along with the rapid development of national economy and the continuous progress of building science and technology, buildings such as super high-rise buildings, super large bridges and the like are continuously developed, because of the huge volume of the buildings, partial super high-rise building foundation piles or bridge pile foundations in China adopt large-diameter manual hole digging piles (D is more than or equal to 2m), the large-diameter manual hole digging piles are designed into hollow piles in some areas, compared with solid piles, the large-diameter manual hole digging piles can save about 50% of concrete consumption under the condition of ensuring that the mechanical property is not changed, the existing large-diameter manual hole digging pile supporting structure has two template systems, the first type is a combined steel template, the main idea is to splice a circle in pile holes by designing 4 circular arc steel plates and a plurality of splicing plates, in the actual engineering, for the overall planning and the most engineering, a universal plate is designed, and most of dado can use the same 4 universal plates, the pile holes are standardized, if individual pile diameters with special sizes exist, construction can still be carried out through the combination of the universal plate and the plurality of seam splicing plates, all the universal plates can be detached after the construction is finished, and then the universal plates are used for the next hole for continuous use, and the method can be recycled, so that the cost can be properly saved; the second construction method is a corrugated template system, a corrugated steel plate is formed by pressing a thin steel plate into corrugations and then rolling the corrugated steel plate into pipe sections, the bending rigidity of the corrugated steel is 22 times of that of a common flat steel plate with the same thickness, and the steel corrugated template is used as a light high-strength material, so that the safety in the construction process can be improved, and meanwhile, the corrugated template system has the characteristic of convenient and rapid construction.

Therefore, a hole digging annular foundation pile U-shaped circular steel tube template system and a construction method need to be designed, although the existing riding embedded part positioning adjustable support and the installation method thereof are various, some common defects still exist in general view, firstly, the template system of the existing supporting structure is too few in type and numerous in type, the existing system is applicable to all projects, and sometimes unreasonable and inapplicable problems exist.

Disclosure of Invention

The invention aims to solve the problems and provide a U-shaped circular steel tube formwork system and a construction method for an annular excavated foundation pile.

The invention realizes the purpose through the following technical scheme: a U-shaped circular steel tube template system of an excavated annular foundation pile comprises a locking notch, a stratum, bottom sealing concrete, a lifting ring, a circular steel tube template, a positioning groove, a centering support, a transverse stiffening rib, a longitudinal stiffening rib, grease, a plastic film, a steel reinforcement cage, a retaining wall, an installation assembly, a bent steel sheet and an anchoring bolt; the locking notch is designed at the top end of a pile hole in the stratum, the bottom sealing concrete is poured at the bottom of the pile hole in the stratum, the hanging ring is welded and fixed at the top end of the circular steel tube template, the circular steel tube template is vertically clamped in the pile hole in the stratum, the positioning groove is formed in the bottom of the circular steel tube template, the centering support is arranged on the upper surface of the bottom sealing concrete, the transverse stiffening rib is horizontally arranged on the inner wall of the circular steel tube template, the longitudinal stiffening rib is vertically arranged on the inner wall of the circular steel tube template, butter is smeared on the outer wall of the circular steel tube template, the plastic film is wrapped on the outer wall of the circular steel tube template, the steel reinforcement cage is nested and connected with the outside of the circular steel tube template, the protective wall is arranged on the outer wall of the steel reinforcement cage, the mounting assembly is fixed on the centering support, and the hollow steel sheet is, the anchor bolts vertically penetrate through and are fixed in the bottom sealing concrete.

Preferably, in order to select the steel plates with corresponding lengths as required, the circular steel tube template is formed by welding the steel plates and designed according to the design size of the bored pile.

Preferably, in order to guarantee that the circular steel tube template can form the circular steel tube mould of thick lower thin "U" type uniform transition when the welding, the circular steel tube template encloses and closes the welded steel sheet and is not the same wide rectangle from top to bottom, but the diameter of going up the mouth of the circular steel tube is unanimous with the construction design picture to the trapezoidal of narrow down and assurance, and the lower extreme opening diameter of circular steel tube will be less than upper end opening diameter 0.1 ~ 0.2D.

Preferably, in order to realize hole bottom positioning, the centering support 7 is fixed in the center of the bottom of the hole during construction of the circular steel tube template, and the centering support 7 and the positioning groove 6 can be automatically nested together when the circular steel tube template is slowly hung.

Preferably, in order to realize quick drawing of patterns, wholly retrieve, the circular steel tube template passes through plastic film and steel reinforcement cage isolation to be sliding type connection through butter and steel reinforcement cage.

A construction method of a U-shaped circular steel tube template system of an annular foundation pile for hole digging comprises the following steps:

step A, designing and manufacturing a circular steel tube template, a positioning groove and a centering support on the ground according to a pile construction design drawing; after the parts are manufactured, the pointed end of the positioning groove faces the interior of the circular steel tube template and is welded to the lower part of the circular steel tube template;

b, constructing a locking notch at the position of the pile hole according to the designed size, excavating the hole downwards along the locking notch, constructing a pile hole protecting wall every 1 linear meter until the elevation of the bottom of the designed hole, and sealing the bottom by using plain concrete to finish the construction of the pile hole;

c, when the bottom sealing concrete reaches the strength of 7d, installing a centering support in the center of the hole bottom, enabling the center point of the centering support to be superposed with the center point of the hole bottom, uniformly distributing anchor bolts on the bottom sealing concrete, and clamping the centering support by using a steel clip;

d, coating a layer of butter on the surface of the circular steel tube template in a thick mode, and then wrapping a layer of plastic film; placing one side for standby after completion;

e, uniformly arranging 4-5 cross braces inside the reinforcement cage 12 from top to bottom; hoisting the reinforcement cage into the pile hole by using a crane, and ensuring the equal distance between the reinforcement cage and the surrounding retaining walls to ensure that the reinforcement cage is positioned at the center of the pile hole; fixing the reinforcement cage from the ground;

step F, integrally hoisting the U-shaped circular steel tube template, slowly lowering the U-shaped circular steel tube template, and firmly embedding the centering support and the positioning groove to ensure that the axis of the circular steel tube template is vertical; waterproof foam is arranged at the gap between the circular steel tube template and the bottom sealing concrete, so that slurry leakage during grouting is prevented;

g, injecting concrete outside the circular steel tube template at one time, waiting for condensation and curing;

step H, after the concrete is initially set, inserting a long steel pipe penetrating through the two lifting rings, arranging jacks at two ends of the steel pipe respectively, jacking the steel pipe upwards at a constant speed, and hammering the round steel pipe template by using a cannon; after the template is separated from the concrete, the circular steel tube template is lifted out by a crane;

step I, dismantling a centering support, an anchoring bolt and a steel clip on the bottom sealing concrete, and completing the recovery construction of a template system;

and step J, continuing maintaining the pile body to finish the construction of the annular foundation pile.

The invention has the beneficial effects that: the riding embedded part positioning adjustable support and the mounting method thereof have reasonable design, the circular steel tube template is formed by welding steel plates, the steel plates with corresponding lengths can be selected according to the design size of a bored pile, the circular steel tube template encloses the welded steel plates, the steel plates are not rectangles with the same width from top to bottom, but trapezoids with wide top and narrow bottom, the diameter of the upper opening of the circular steel tube is ensured to be consistent with a construction design drawing, the diameter of the lower opening of the circular steel tube is 0.1-0.2D less than that of the upper opening, the circular steel tube template can form a circular steel tube mould with a U-shaped uniform transition from thick top to thin bottom during welding, the centering support 7 is firstly fixed in the center of the bottom of a hole during circular steel tube template construction, the centering support 7 and the positioning groove 6 can be automatically nested together when the circular steel tube template is slowly hung into the circular steel tube template, hole bottom positioning is realized, the circular steel tube template is isolated from a steel reinforcement cage through a, realize quick drawing of patterns, whole recovery.

Drawings

FIG. 1 is an overall schematic view of the present invention;

FIG. 2 is a schematic view of a U-shaped circular steel tube formwork assembly according to the present invention;

FIG. 3 is a schematic cross-sectional view of a round steel pipe of the present invention;

FIG. 4 is a schematic view of a centering pedestal according to the present invention;

FIG. 5 is a schematic view of a positioning slot of the present invention;

FIG. 6 is a schematic cross-sectional view of a pile bore of the present invention;

FIG. 7 is an enlarged partial cross-sectional view of a pile bore of the present invention;

FIG. 8 is a schematic view of the alignment bracket mounting of the present invention;

FIG. 9 is an enlarged partial schematic view of the mounting assembly of the present invention;

fig. 10 is a schematic view of a mounting assembly of the present invention.

In the figure: 1. the steel pipe formwork comprises a locking notch, 2 parts of ground, 3 parts of bottom sealing concrete, 4 parts of a lifting ring, 5 parts of a circular steel pipe formwork, 6 parts of a positioning groove, 7 parts of a centering support, 8 parts of a transverse stiffening rib, 9 parts of a longitudinal stiffening rib, 10 parts of grease, 11 parts of a plastic film, 12 parts of a plastic film, 13 parts of a protective wall, 14 parts of a mounting component, 15 parts of a steel clip and 16 parts of an anchoring bolt.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 10, a U-shaped circular steel tube template system of an excavated annular foundation pile comprises a locking notch 1, a ground layer 2, bottom-sealing concrete 3, a lifting ring 4, a circular steel tube template 5, a positioning groove 6, a centering support 7, a transverse stiffening rib 8, a longitudinal stiffening rib 9, butter 10, a plastic film 11, a reinforcement cage 12, a retaining wall 13, a mounting assembly 14, a bent steel sheet 15 and an anchor bolt 16; the locking notch 1 is designed at the top end of a pile hole in a stratum 2, the bottom sealing concrete 3 is poured at the bottom of the pile hole in the stratum 2, the hanging ring 4 is welded and fixed at the top end of the circular steel tube template 5, the circular steel tube template 5 is vertically clamped in the pile hole in the stratum 2, the positioning groove 6 is arranged at the bottom of the circular steel tube template 5, the centering support 7 is arranged on the upper surface of the bottom sealing concrete 3, the transverse stiffening rib 8 is horizontally arranged on the inner wall of the circular steel tube template 5, the longitudinal stiffening rib 9 is vertically arranged on the inner wall of the circular steel tube template 5, the grease 10 is smeared on the outer wall of the circular steel tube template 5, the plastic film 11 is wrapped on the outer wall of the circular steel tube template 5, the steel reinforcement cage 12 is nested and connected outside the circular steel tube template 5, the protective wall 13 is arranged on the outer wall of the steel reinforcement cage 12, the mounting assembly 14 is fixed on, the bent steel sheet 15 is fixedly connected with the centering support 7 through an anchor bolt 16, and the anchor bolt 16 vertically penetrates through and is fixed in the bottom sealing concrete 3.

The circular steel tube template 5 is formed by welding steel plates, the steel plates with corresponding lengths can be selected according to the design size of the bored pile, the circular steel tube template 5 is not a rectangle with the same width from top to bottom but a trapezoid with the wide top and the narrow bottom, the diameter of the upper opening of the circular steel tube is consistent with a construction design drawing, the diameter of the lower opening of the circular steel tube is 0.1-0.2 DD smaller than that of the upper opening, the circular steel tube template 5 is ensured to form a circular steel tube mould with a U-shaped uniform transition from the thick top to the thin bottom during welding, the centering support 7 is firstly fixed in the center of the bottom of a hole during construction of the circular steel tube template 5, the centering support 7 and the positioning groove 6 can be automatically nested together when the circular steel tube template 5 is slowly hung into the circular steel tube template 5, hole bottom positioning is realized, the circular steel tube template 5 is isolated from the steel reinforcement cage 12 through the plastic film 11 and is connected with the steel reinforcement cage 12 in a, realize quick drawing of patterns, whole recovery.

A construction method of a U-shaped circular steel tube template system of an annular foundation pile for hole digging comprises the following steps:

step A, designing and manufacturing a circular steel tube template 5, a positioning groove 6 and a centering support 7 on the ground according to a pile construction design drawing; after the parts are manufactured, the pointed end of the positioning groove 6 faces the interior of the circular steel tube template 5 and is welded to the lower part of the circular steel tube template 5;

b, constructing a locking notch 1 at the position of the pile hole according to the designed size, excavating the hole downwards along the locking notch 1, constructing a pile hole protecting wall 13 every 1 linear meter until the elevation of the bottom of the designed hole, and sealing the bottom by using plain concrete to finish the construction of the pile hole;

step C, when the bottom sealing concrete 3 reaches the strength of 7d, installing a centering support 7 in the center of the hole bottom, enabling the center point of the centering support 7 to be overlapped with the center point of the hole bottom, uniformly distributing anchoring bolts 16 on the bottom sealing concrete 3, and clamping the centering support 7 by using a steel clip 15;

d, coating a layer of butter 10 on the surface of the circular steel tube template 5 in a thick mode, and then wrapping a layer of plastic film 11; placing one side for standby after completion;

e, uniformly arranging 4-5 cross braces inside the reinforcement cage 12 from top to bottom; hoisting the reinforcement cage 12 into the pile hole by a crane, and ensuring the equal distance between the reinforcement cage and the surrounding protective walls 13 to ensure that the reinforcement cage is positioned at the center of the pile hole; and the reinforcement cage 12 is fixed from the ground;

step F, integrally hoisting the U-shaped circular steel tube template 5, slowly lowering the U-shaped circular steel tube template, and firmly embedding the centering support and the positioning groove 6 to ensure that the axis of the circular steel tube template 5 is vertical; waterproof foam is arranged at the gap between the circular steel tube template 5 and the bottom sealing concrete 3, so that slurry leakage during grouting is prevented;

g, injecting concrete outside the circular steel tube template 5 at one time, waiting for condensation and curing;

step H, after the concrete is initially set, inserting a long steel pipe penetrating through the two lifting rings 4, arranging jacks at two ends of the steel pipe respectively, jacking the steel pipe upwards at a constant speed, and hammering the round steel pipe template 5 by using a cannon; after the round steel pipe template 5 is separated from the concrete, the round steel pipe template is lifted out by a crane;

step I, dismantling the centering support 7, the anchor bolt 16 and the steel clip 15 on the bottom sealing concrete 3 to complete the recovery construction of the template system;

and step J, continuing maintaining the pile body to finish the construction of the annular foundation pile.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.